Pannonian sea

The Pannonian Plain is a large plain in Central Europe that remained when the Pliocene Pannonian Sea dried out. It is a geomorphological subsystem of the Alps-Himalaya system.

Serbia, Belgrade by Katarina 2353

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inspecting petroglyphs

Canyonlands National Park, Utah. Frank Masland inspecting petroglyphs in the lower part of the south fork of Horse Canyon in The Maze. Photo by U.S. National Park Service, May 1962.

U.S. Geological Survey Photographic Library

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